High-tension insulator.



G. SEMENZA. HIGH TENSION INSULATOR. APPLICATION FILED FEB. 5, 1906.

Patented Dem 8,1908.

UNITED STATES PATENT OFFICE.

GUIDO SEMENZA, OF MILAN, ITALY.

HIGH-TENSION INSULATOR.

1'0 all whom it may concern:

Be it known that I, Guino SEMENZA, elec trical engineer, subject of the King of Italy,

residing at 4 Via Paleocapa, Milan, Italy, have invented certain new and useful Ir'nprovements in High-Tension Insulators; and I do hereby declare the following to be a full, clear, and exact description of the invention,

7 such as will enable others skilled in the art to tends'outwardly to a considerable extent to protect from water the smaller and lower petticoats. VVhenthe upper petticoat has got wet, its tension is the same as that of the conductor, wherefore its upper surface is quite inefficient from the point of View of insulation. Moreover the water drops, falling down from the upper petticoat, when succeeding each other at short intervals, offer an easy path to the disruptive discharges be tween the edge of the petticoat itself and the supporting pin or the cross arm. For the above reason high tension insulators usually are very large and very. difficult to manufacture so much the more that the upper petticoats'must, in spite of the size be made with the utmost care in order to resist disruptive breakdown or puncture.

According tn the present invention, the different tasks are accomplished by different part-sot the insulator and the troubles, depending upon the rain, are obviated so as to afl'ord' an insulator the efficiency of which, against external disruptive discharges, is almost as high in'wet as in dry weather. This result is attained by making the insulator of two distinct parts; the lower one namely the insulator proper is intended to support the conductor and does not require any outwardly extending upper petticoat; the upper part, which is termed the cap, is secured above the insulator proper and. may be formed of any insulating material whatever as it is only intended to protect the lower etticoats of the insulator roper from rain, rendering the water drops d i'ipping from said upper cap innocuous.

Specification of Letters Patent.

The outer petticoat, on the Patented Dec. 8, 1908.

Application filed February 5, 1906. Serial No. 29?,588.

Figures 1 and 2 show, by way of example only, two manners of carrying out my invention.

In both figures the upper cap of umbrella 1 made of porcelain, glass or any other conven ient material, is fitted with two gutters 2, situated at the ends of the same diameter and preventing the water drops from directly falling on the conductor or wire 7. The lower edge of the cap must be so shaped as to facilitate the vertical falling of the drops; in the example shown by the drawings thelower face of the cap consists in a plan having a sharp cutting outer edge.

The cap is secured to thetop of the insula tor proper by means of a threaded spigot 5 entering a socket 4 correspondingly threaded, with which the cap is provided; but the connection between the ca and the insulator proper may .be obtained y any other convenient means (cements and the like).

The insulator roper may be formed either of one or severe pleces of any shape whatever. The uppermost pettiooats of the insulator proper must be much smaller in diameter than the cap in order. that the protection against the rain, aiiorded by the latter, may prove an efiicient one.

According to Fig. 1 the spigot shaped top 5 of the insulator roper is fitted with screw threads for securing the cap thereto; a lower circular recess 6 is intended to receive the conductor 7, if it is to be tied to the insulator laterally; the petticoats 8 may be more or less in number and have any convenient shape according to the circumstances. According to Fig. 2 the top 5 is fitted with a central recess 9 wherein the conductor 7 rests, in the case of central tying. being resorted to.

The inspection of the figures show:

(1) That the-cap has no insulating function, so as to allow of its being composed of a material of low dielectric rigidity while its The which owin to the conductor having a. certain sag,- fol owsthe same up to a certain extent before leaving it.-

(4.) That the etticoats (8) situated be-,

are completely protected therelow the pralp by and therefore remain dry.

' All in allthe insulator roper may hence forth be made much sma er and its man-u? facture will prove much easier and cheaper than it is the case Withthe "resent types.

. The insulators proper will ave to be fitted von their supporting ins without the respective caps which wn be only mounted after the complete erection of the transmission line. Nowwhat I claim is:'

4 -1. In a tension insulator, the combination, with a conductor and a conductorcarrier of insulating material having a portion projecting above the conductor, of a cap.

of insulating materialzsecured to the conductor-c'arrier and out of contact with the conductor, said cap extending over the conductor-carrier.

- z. A high tension insulator; having a top sectionwith wide flat rim, a lower wide flat rim section at a considerable distance from the first, and an intermediate distance plece connecting the other two sections 3; A high tension insulator having a top and spigotconstruction, and a flaring petticoat section below the second wide rim section.

, In testimony whereof I affix my signature to this specification, in the presence of two witnesses.

GUIDO SEMENZA. Witnesses:

P. SMITH, NIDE DRAGO. 

